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// SPDX-License-Identifier: GPL-2.0 OR MIT
/**************************************************************************
*
* Copyright 2009-2015 VMware, Inc., Palo Alto, CA., USA
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sub license, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial portions
* of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
* THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
* USE OR OTHER DEALINGS IN THE SOFTWARE.
*
**************************************************************************/
#include "vmwgfx_drv.h"
#include <drm/drmP.h>
#include <drm/ttm/ttm_bo_driver.h>
#define VMW_PPN_SIZE (sizeof(unsigned long))
/* A future safe maximum remap size. */
#define VMW_PPN_PER_REMAP ((31 * 1024) / VMW_PPN_SIZE)
#define DMA_ADDR_INVALID ((dma_addr_t) 0)
#define DMA_PAGE_INVALID 0UL
static int vmw_gmr2_bind(struct vmw_private *dev_priv,
struct vmw_piter *iter,
unsigned long num_pages,
int gmr_id)
{
SVGAFifoCmdDefineGMR2 define_cmd;
SVGAFifoCmdRemapGMR2 remap_cmd;
uint32_t *cmd;
uint32_t *cmd_orig;
uint32_t define_size = sizeof(define_cmd) + sizeof(*cmd);
uint32_t remap_num = num_pages / VMW_PPN_PER_REMAP + ((num_pages % VMW_PPN_PER_REMAP) > 0);
uint32_t remap_size = VMW_PPN_SIZE * num_pages + (sizeof(remap_cmd) + sizeof(*cmd)) * remap_num;
uint32_t remap_pos = 0;
uint32_t cmd_size = define_size + remap_size;
uint32_t i;
cmd_orig = cmd = VMW_FIFO_RESERVE(dev_priv, cmd_size);
if (unlikely(cmd == NULL))
return -ENOMEM;
define_cmd.gmrId = gmr_id;
define_cmd.numPages = num_pages;
*cmd++ = SVGA_CMD_DEFINE_GMR2;
memcpy(cmd, &define_cmd, sizeof(define_cmd));
cmd += sizeof(define_cmd) / sizeof(*cmd);
/*
* Need to split the command if there are too many
* pages that goes into the gmr.
*/
remap_cmd.gmrId = gmr_id;
remap_cmd.flags = (VMW_PPN_SIZE > sizeof(*cmd)) ?
SVGA_REMAP_GMR2_PPN64 : SVGA_REMAP_GMR2_PPN32;
while (num_pages > 0) {
unsigned long nr = min(num_pages, (unsigned long)VMW_PPN_PER_REMAP);
remap_cmd.offsetPages = remap_pos;
remap_cmd.numPages = nr;
*cmd++ = SVGA_CMD_REMAP_GMR2;
memcpy(cmd, &remap_cmd, sizeof(remap_cmd));
cmd += sizeof(remap_cmd) / sizeof(*cmd);
for (i = 0; i < nr; ++i) {
if (VMW_PPN_SIZE <= 4)
*cmd = vmw_piter_dma_addr(iter) >> PAGE_SHIFT;
else
*((uint64_t *)cmd) = vmw_piter_dma_addr(iter) >>
PAGE_SHIFT;
cmd += VMW_PPN_SIZE / sizeof(*cmd);
vmw_piter_next(iter);
}
num_pages -= nr;
remap_pos += nr;
}
BUG_ON(cmd != cmd_orig + cmd_size / sizeof(*cmd));
vmw_fifo_commit(dev_priv, cmd_size);
return 0;
}
static void vmw_gmr2_unbind(struct vmw_private *dev_priv,
int gmr_id)
{
SVGAFifoCmdDefineGMR2 define_cmd;
uint32_t define_size = sizeof(define_cmd) + 4;
uint32_t *cmd;
cmd = VMW_FIFO_RESERVE(dev_priv, define_size);
if (unlikely(cmd == NULL))
return;
define_cmd.gmrId = gmr_id;
define_cmd.numPages = 0;
*cmd++ = SVGA_CMD_DEFINE_GMR2;
memcpy(cmd, &define_cmd, sizeof(define_cmd));
vmw_fifo_commit(dev_priv, define_size);
}
int vmw_gmr_bind(struct vmw_private *dev_priv,
const struct vmw_sg_table *vsgt,
unsigned long num_pages,
int gmr_id)
{
struct vmw_piter data_iter;
vmw_piter_start(&data_iter, vsgt, 0);
if (unlikely(!vmw_piter_next(&data_iter)))
return 0;
if (unlikely(!(dev_priv->capabilities & SVGA_CAP_GMR2)))
return -EINVAL;
return vmw_gmr2_bind(dev_priv, &data_iter, num_pages, gmr_id);
}
void vmw_gmr_unbind(struct vmw_private *dev_priv, int gmr_id)
{
if (likely(dev_priv->capabilities & SVGA_CAP_GMR2))
vmw_gmr2_unbind(dev_priv, gmr_id);
}
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